gistfile1.cs

public void MyMethod()
{
  switch ( something )
  {
	// other stuff ...

	case x:
	{
		// do some stuff here
		// need to perform case y too for this specific case
                 DoSomethingImportant();
		//break; // not allowed to not have the break
		
	}

	case y:
	{
                DoSomethingImportant();
		// do some more stuff here
		break;
	}
  }
}

public void DoSomethingImportant()
{
   //Some logic that needs to be reused
}